Hello lau! How have you been? GREAT! Glad to hear it! Me? Well... I am trying to build the realtime-preempt 2.6.13-rc4-RT-V0.7.52-07 kernel but I think a file is missing an include .h reference somewhere, 'cause I keep getting: LD .tmp_vmlinux1 net/built-in.o(.text+0x1d4dc): In function `rt_check_expire': : undefined reference to `__bad_spinlock_type' net/built-in.o(.text+0x1d4fe): In function `rt_check_expire': : undefined reference to `__bad_spinlock_type' net/built-in.o(.text+0x1d5e1): In function `rt_run_flush': : undefined reference to `__bad_spinlock_type' net/built-in.o(.text+0x1d5f9): In function `rt_run_flush': : undefined reference to `__bad_spinlock_type' net/built-in.o(.text+0x1d862): In function `rt_garbage_collect': : undefined reference to `__bad_spinlock_type' net/built-in.o(.text+0x1d890): more undefined references to `__bad_spinlock_type' follow make: *** [.tmp_vmlinux1] Error 1 My machine is a p3 dell laptop running Fedora Core 3. Thank you Lau for any help you can offer, and the steamy night we shared out behind that Perkins last friday. With love, -thewade